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Annotation of researchv10dc/man/manb/hp.4, revision 1.1

1.1     ! root        1: .TH HP 4 
        !             2: .UC 4
        !             3: .SH NAME
        !             4: hp \- RP06, RM03, RM-05 moving-head disk
        !             5: .SH DESCRIPTION
        !             6: Files with minor device numbers 0 through 7 refer to various portions
        !             7: of drive 0;
        !             8: minor devices 8 through 15 refer to drive 1, etc.
        !             9: .PP
        !            10: The origin and size of the pseudo-disks on each drive are
        !            11: as follows:
        !            12: .PP
        !            13: .nf
        !            14: .ta .5i +\w'000000    'u +\w'000000    'u
        !            15: RP03 partitions
        !            16:        disk    start   length
        !            17:        0       0       15884
        !            18:        1       15884   33440
        !            19:        2       40964   8360
        !            20:        3       0       0
        !            21:        4       0       0
        !            22:        5       0       0
        !            23:        6       49324   291346
        !            24:        7       0       0
        !            25: .PP
        !            26: .nf
        !            27: RM03 partitions
        !            28:        disk    start   length
        !            29:        0       0       15884
        !            30:        1       16000   33440
        !            31:        2       0       0
        !            32:        3       0       0
        !            33:        4       0       0
        !            34:        5       0       0
        !            35:        6       49600   82080
        !            36:        7       0       0
        !            37: .PP
        !            38: .nf
        !            39: RM05 partitions
        !            40:        disk    start   length
        !            41:        0       0       15884
        !            42:        1       16416   33440
        !            43:        2       0       500992
        !            44:        3       341696  15884
        !            45:        4       358112  55936
        !            46:        5       414048  36944
        !            47:        6       341696  159296
        !            48:        7       49856   291346
        !            49: .fi
        !            50: .DT
        !            51: .PP
        !            52: It is unwise for all of these files to be present in one installation,
        !            53: since there is overlap in addresses and protection becomes
        !            54: a sticky matter.
        !            55: Ordinarily devices 0 and 6
        !            56: on rp06 and rm03 drives,
        !            57: and 0, 7, and either 6 or 5, 6, and 7 on rm05 drives.
        !            58: Note that the file system sizes are chosen to allow the partitions
        !            59: to be copied between the rp06's and rm05's.
        !            60: This is done so that systems with mixed drives
        !            61: will be able to rearrange file systems easily
        !            62: (see also
        !            63: .IR up (4)).
        !            64: Device 2 is the entire pack,
        !            65: and is used in pack-to-pack copying.
        !            66: .PP
        !            67: The
        !            68: block
        !            69: files
        !            70: access the disk via the system's normal
        !            71: buffering mechanism
        !            72: and may be read and written without regard to
        !            73: physical disk records.
        !            74: There is also a `raw' interface
        !            75: which provides for direct transmission between the disk
        !            76: and the user's read or write buffer.
        !            77: A single read or write call results in exactly one I/O operation
        !            78: and therefore raw I/O is considerably more efficient when
        !            79: many words are transmitted.
        !            80: The names of the raw files
        !            81: conventionally
        !            82: begin with
        !            83: an extra `r.'
        !            84: .SH FILES
        !            85: .ta 2i
        !            86: /dev/rp[0-3][a-h]      block files
        !            87: .br
        !            88: /dev/rrp[0-3][a-h]     raw files
        !            89: .SH SEE ALSO
        !            90: rp(4)
        !            91: .SH BUGS
        !            92: In raw I/O
        !            93: .I read
        !            94: and
        !            95: .IR write (2)
        !            96: truncate file offsets to 512-byte block boundaries,
        !            97: and
        !            98: .I write
        !            99: scribbles on the tail of incomplete blocks.
        !           100: Thus,
        !           101: in programs that are likely to access raw devices,
        !           102: .I read, write
        !           103: and
        !           104: .IR lseek (2)
        !           105: should always deal in 512-byte multiples.

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